mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-11 12:28:41 +08:00
94 lines
2.6 KiB
C
94 lines
2.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Simple MFD - I2C
|
|
*
|
|
* Author(s):
|
|
* Michael Walle <michael@walle.cc>
|
|
* Lee Jones <lee.jones@linaro.org>
|
|
*
|
|
* This driver creates a single register map with the intention for it to be
|
|
* shared by all sub-devices. Children can use their parent's device structure
|
|
* (dev.parent) in order to reference it.
|
|
*
|
|
* Once the register map has been successfully initialised, any sub-devices
|
|
* represented by child nodes in Device Tree or via the MFD cells in this file
|
|
* will be subsequently registered.
|
|
*/
|
|
|
|
#include <linux/i2c.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/mfd/core.h>
|
|
#include <linux/module.h>
|
|
#include <linux/of_platform.h>
|
|
#include <linux/regmap.h>
|
|
|
|
#include "simple-mfd-i2c.h"
|
|
|
|
static const struct regmap_config regmap_config_8r_8v = {
|
|
.reg_bits = 8,
|
|
.val_bits = 8,
|
|
};
|
|
|
|
static int simple_mfd_i2c_probe(struct i2c_client *i2c)
|
|
{
|
|
const struct simple_mfd_data *simple_mfd_data;
|
|
const struct regmap_config *regmap_config;
|
|
struct regmap *regmap;
|
|
int ret;
|
|
|
|
simple_mfd_data = device_get_match_data(&i2c->dev);
|
|
|
|
/* If no regmap_config is specified, use the default 8reg and 8val bits */
|
|
if (!simple_mfd_data || !simple_mfd_data->regmap_config)
|
|
regmap_config = ®map_config_8r_8v;
|
|
else
|
|
regmap_config = simple_mfd_data->regmap_config;
|
|
|
|
regmap = devm_regmap_init_i2c(i2c, regmap_config);
|
|
if (IS_ERR(regmap))
|
|
return PTR_ERR(regmap);
|
|
|
|
/* If no MFD cells are specified, register using the DT child nodes instead */
|
|
if (!simple_mfd_data || !simple_mfd_data->mfd_cell)
|
|
return devm_of_platform_populate(&i2c->dev);
|
|
|
|
ret = devm_mfd_add_devices(&i2c->dev, PLATFORM_DEVID_AUTO,
|
|
simple_mfd_data->mfd_cell,
|
|
simple_mfd_data->mfd_cell_size,
|
|
NULL, 0, NULL);
|
|
if (ret)
|
|
dev_err(&i2c->dev, "Failed to add child devices\n");
|
|
|
|
return ret;
|
|
}
|
|
|
|
static const struct mfd_cell sy7636a_cells[] = {
|
|
{ .name = "sy7636a-regulator", },
|
|
{ .name = "sy7636a-temperature", },
|
|
};
|
|
|
|
static const struct simple_mfd_data silergy_sy7636a = {
|
|
.mfd_cell = sy7636a_cells,
|
|
.mfd_cell_size = ARRAY_SIZE(sy7636a_cells),
|
|
};
|
|
|
|
static const struct of_device_id simple_mfd_i2c_of_match[] = {
|
|
{ .compatible = "kontron,sl28cpld" },
|
|
{ .compatible = "silergy,sy7636a", .data = &silergy_sy7636a},
|
|
{}
|
|
};
|
|
MODULE_DEVICE_TABLE(of, simple_mfd_i2c_of_match);
|
|
|
|
static struct i2c_driver simple_mfd_i2c_driver = {
|
|
.probe_new = simple_mfd_i2c_probe,
|
|
.driver = {
|
|
.name = "simple-mfd-i2c",
|
|
.of_match_table = simple_mfd_i2c_of_match,
|
|
},
|
|
};
|
|
module_i2c_driver(simple_mfd_i2c_driver);
|
|
|
|
MODULE_AUTHOR("Michael Walle <michael@walle.cc>");
|
|
MODULE_DESCRIPTION("Simple MFD - I2C driver");
|
|
MODULE_LICENSE("GPL v2");
|